Lots of things could cause that light to come on. And as someone who's just replace my own maf sensor, trust me you don't want to buy a new one unless you really have to. ($120)
The sensor is at the end of the intake hose leading from the airbox to the engine. It's a small, black box-like thing about 2x3 inches i'd say. 2 tamper-resistant screws hold it in place. No need to dismantle anything to get to it. Unless you have the plastic supercharger cover over the engine, the sensor is sitting right on top. You cannot clean it as that's probably not the reason it'd stop working.
Usually, some place like Advanced Auto will scan the car with their computer to tell you what code is triggering the service light. Highly recommend you do that before you go replacing expensive parts.
I found a picture of what your maf sensor probably looks like.
http://www.resnet.trinity.edu/jmccool/MAF.JPG